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Deputy opposition leader James Merlino said Mr Ryan was the last man standing after it was revealed there was a plot run out of his office to tear down former chief commissioner Simon Overland. Mr Overland quit in June 2011.

Comment has been sought from Mr Ryan.

He has repeatedly said he was unaware of the campaign to undermine Mr Overland despite it involving his adviser, Tristan Weston.

Mr Ryan told parliament last week he co-operated with the Office of Police Integrity (OPI) when questioned on the matter.

"At all times I have told the absolute truth," he said.

Mr Weston quit Mr Ryan's office last year and the deputy premier's parliamentary secretary for police, Bill Tilley, also resigned after the OPI criticised him.

Last week, Ted Baillieu resigned as premier and his chief of staff Tony Nutt quit after it was revealed he reportedly promised to help Mr Weston find work.

Mr Baillieu referred the matter to the anti-corruption watchdog before resigning as premier.

The deputy opposition leader said Mr Ryan should have quit long before others lost their jobs.

"The first person that should have lost his job is Peter Ryan and yet Peter Ryan, like the political cockroach that he is, remains standing," Mr Merlino said.

"Cockroaches, as I understand it, survive nuclear devastation."

Mr Merlino said Mr Wells was a great disappointment as treasurer and should lose the portfolio.

There have been some gloomy figures released this year concerning Victoria's economy.

Victoria's jobless rate is 6.1 per cent, some 0.7 percentage points higher than the national average. Spending by consumers, business and government slumped in the last six months of 2012.